If you want to undertake adjustments on your own Gilera SC 125 then it is always a great idea to own a Workshop Manual for a reference in the event that you want to know techniques to strip off a particular component for example, the Gearbox and match it again in the correct manner.
Gilera SC 125 Workshop Manuals offers clear targeted diagnostic guidelines with regards to your car or truck therefore if something is wrong it can help you identify what the issue is and how you can repair it. You can then evaluate if you can do this on your own or if the job is simply too big you can actually make a booking for your SC 125 into a nearby mechanic.
Gilera SC 125 manual